Sig does still make the wonder but it is far too much airplane for an .061. I am building one right now for a K&B .18. I have built the HOB Mustang. Great flying airplane and flies pretty well on a Norvel .061 but is no speed demon for sure. Just enough power to make the plane fun. For my money, with that engine, I don't think you could do any better than a Jr Falcon or Jr Skylark from Early RC Models. I have one of each and both will fly very well with the .061. My Jr Falcon has a Norvel AME .061 and it is surprisingly fast. They both build easily and are not a huge investment.

Brian